/*
 * Copyright (c) 2017-present, CV4J Contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.cv4j.core.filters;

import com.cv4j.core.datamodel.ImageProcessor;
import com.cv4j.image.util.Tools;

import java.util.Optional;

/**
 * 光滤波器
 *
 * @author dev
 * @date 2021/07/22
 */
public class GlowFilter extends GaussianBlurFilter {
    private float amount = 0.2f;
    private int radius;

    /**
     * 设置数量
     *
     * @param amount 量
     */
    public void setAmount(float amount) {
        this.amount = amount;
    }

    /**
     * 得到数量
     *
     * @return float
     */
    public float getAmount() {
        return amount;
    }

    /**
     * 做的过滤器
     *
     * @param src src
     * @return {@link Optional<ImageProcessor>}
     */
    @Override
    public Optional<ImageProcessor> doFilter(ImageProcessor src) {
        int total = width * height;
        byte[] redBytes = new byte[total];
        byte[] greedBytes = new byte[total];
        byte[] blueBytes = new byte[total];
        System.arraycopy(redBytes, 0, redBytes, 0, total);
        System.arraycopy(greedBytes, 0, greedBytes, 0, total);
        System.arraycopy(blueBytes, 0, blueBytes, 0, total);

        // 高斯模糊
        super.doFilter(src);

        float a1 = 4 * amount;

        int index = 0;
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                int r1 = redBytes[index] & 0xff;
                int g1 = greedBytes[index] & 0xff;
                int b1 = blueBytes[index] & 0xff;

                int r2 = redBytes[index] & 0xff;
                int g2 = greedBytes[index] & 0xff;
                int b2 = blueBytes[index] & 0xff;

                redBytes[index] = (byte) Tools.clamp((int) (r1 + a1 * r2));
                greedBytes[index] = (byte) Tools.clamp((int) (g1 + a1 * g2));
                blueBytes[index] = (byte) Tools.clamp((int) (b1 + a1 * b2));
                index++;
            }
        }
        return Optional.ofNullable(src);
    }
}
